The slot length is not standard. Ninety minutes for one dog and three hours for another means a diary built on fixed appointments either wastes half a day or runs late from mid-morning.
The record belongs to the dog. Which clipper length was used, where it dislikes being handled and how it behaved last time turns the second appointment into a calmer and faster one.
Rebooking happens at the door or not at all. A dog booked in for eight weeks' time as it is collected is a retained client; one that leaves without a date returns in five months with a matted coat.
Health records are a condition of entry and they expire. Vaccination status and any conditions that affect handling need checking before the appointment rather than discovered on the table.